1. (15 points) According to the Greenshields' Model, sketch the speed-density, speed-flow,and flow-density relationships on the charts below. The curves do not need to be exact, but the critical values should be correctly labeled and located. These critical values include: jam density (k), free-flow speed (u), capacity (qm), density at capacity (km) and speed at capacity(Um).

Fig: 1

Fig: 2